How to Hide the "CloudFront Settings" Admin Menu

function plt_hide_c3_cloudfront_clear_cache_menus() {
	//Hide the "Settings → CloudFront Settings" menu.
	remove_submenu_page('options-general.php', 'c3-admin-menu');
}

add_action('admin_menu', 'plt_hide_c3_cloudfront_clear_cache_menus', 11);

Where do I put this code?